Valve-grinding device



C. C. LOTT.

VALVE GRINDING DEVICE. I APPLlCATlON FILED DEC.28, 1920- 1300365; Patented Dec.13,1921.

UNITED sTAres CLARENCE C. LOTT, OF NEW YORK, N. Y.

venvn-eninnine DEVICE.

Specification of Letters Patent.

PatentedDec. 13, 1921.

Application filed December 28, 1920. Serial No. 433,710.

To all whom it may concern:

Beit known that I. CLARENCE (J. LOTT, a citizen of the United vtitties, residing at New York in the county and fitate of New York, have invented certain new and useful improvements in Valve-Grinding Devices, of which the following is a full, clear, and exact specification. This invention relates to devices for grinding puppet valves in their-seats, and is especially designed for use on internal combustion engines.

It is the ob'ect of the invention to provide a simple and inexpensive device which may be easily attached to the cylinder block of an engine and'adjusted from a single supporting point so as to operate on a plurality of valves located at different distances from said point. Another .object is to provide improved meansforengaging and disengaging the valve oscillating memher of the device with the valvesiwhile the supporting bracket therefor is held. rigidly in place.

proceeds.

The invention will be first hereinafter described in connection with the accompanying drawings which constitute part of this specification, and then more specifically defined in the claims at the end of the description.

In the accompanying drawings, wherein similar reference characters are used to designate corresponding parts throughout the several views Figure 1 is a broken plan view of an internal combustion engine showing one of my valve grinding devices adjusted thereto to actuate one of the valves in solid lines and the position of said device when acting on another valve farther away from the point of support in dotted lines.

Fig. 2 is a vertical sectional view through a portion of the top of the engine in the plane of one of the valves and the supporting bolt for the device, showing said device in operative engagement with the valve in solid lines and disengaged with said valve in dotted lines, and

Fig. 3 is a plan view of a fragment of the engine showing the valve grinding device on a larger scale than in Fig. 1.

The engine is indicated at 1 in the drawings, cylinder bores at 2 and valves at 8,

each of the latter having the usual wrench receiving. sockets 1 in its top.

The valve grinding device comprires a bracket 5, having a horizontalportion provided with a longitudinal slot 7, and an upwardly extending arm 8 preferably arranged at an incline and having a vertical bearing 9 at its upper end for the oscillating shaft 10. V Said shaft extends below the bear- 1ng andcarries on its lower end a tip 11 preferably connected to the shaft by a cross pin 12 and having projecting lugs 13 to engage the sockets 4 in the top of the valve 3. A coiled spring l l is mounted around the shaft 10 so as to bear at its lower end against the tip 11 and at its upper end against a washer 15 under the bearing 9. Said spring tends to press the tip 11 down- -ward so that the lugs 13 will engage the notches or sockets t as shown in solid lines inFlg. 2. y

The shaft 10 also extends above the bearit i ing 9 andis bent to form the horizontally Other ob ectsgwi-ll"appear. as the description extending handle 16. To limitthe downward movement of the shaft under the ten sion of the spring 14, a cross pin 1'? is passed through the upper end portion of said shaft so as to rest upon the upper end of the bean ing 9. One end 18 of said pin projects from the shaft farther than the other end and is adapted to ride upon a cam surface 19 of arcuate form rising from one side of the top of the bearing 9 when the shaft is turned far enough around. When the shaft is turned about as shown in dotted lines in Fig. 2, and the longer end 18 of the pin 17 rides upon the cam surface 19, the shaft is raised against the tension of the spring far enough to disengage the lugs 18 from the sockets 4 of the valve. The shaft may be arranged and held in that position while the device is being adjusted into proper position to operate upon a valve, or after one valve has been ground and the device is to be moved or swung about into position to grind another one.

The bracket is held in place during the oscillation of the shaft and valve, for accomplishing the grinding or re-seating operation, by means of a bolt 20 which may be screwed into a tapped socket 21 in the cylinder block of the engine. Said socket 21 may be one of the sockets provided for fastening the top plate-of the engine to the cylinder 2 block or it may be formed especially for the purpose of holding the bolt, the head 22 of which is adapted to support the horizontal portion 6 of the bracket 5. A threaded shank 23 extends upward from the head 22 of the bolt and passes through the slot 7 in said horizontal portion 6 of the bracket, there being a thumb nut 2 1 on said shank for clamping the bracket to the bolt at any de sired point along the slot so that the oscillat ing shaft may be positioned directly over any one of several valves without moving the bolt 20.- Thus, as shown in Fig. 1, the bolt may be engaged with a socket located equidistant from two adjacent valves, and the bracket adjusted to bring the oscillating shaft directly over one of said adjacent valves, as indicated in solid lines, or said bracket, by reason of the slot 7 may be adjusted so as to bring the shaft'over a valve which is farther removed from the bolt, as indicated in dotted lines.

The horizontal portion of the bracket is shown long enough in Fig. 1 to permit four valves to be reached from a single location of the supporting bolt 20,-so that only one insertion of said bolt is necessary for grind.

ing the valves for every two cylinders of an engine. The grinding is accomplished, after the shaft has been engaged with the valve, by oscillating said shaft by means of the handle 16, the pin 17 engaging the smooth upper end of the bearing 9. When it is de sired to disengage the shaft from the valve, the handle is thrown farther. round so as to cause the longer end 18 of said pin to ride upon the cam surface 19, as. already def for limiting the movement of the shaft under the influence 'of'the I resilient means, said projection being adapted to move on said hearing as the shaft is rotated during the grinding operation and a fixed cam on said upper end of the bearing to be engaged by said projection during a part of its revolution for disengaging said shaft from a valve.

2. In a valve grinding device of the character described, the combination with a bracket having a bearing, of a shaft journaled in said bearing, resilient means for pressing one end of the shaft into engagement with 'a valve, a fixed cam extending partially around the bearing, and a projection on the shaft to ride on said cam for disengaging the shaft from the valve against the resiliency of the pressing means, said projection also adapted to movejon said bearing between the ends of the camjfor 

